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Can anyone pls teach me how to find the extrema of this function (general second degree polynomial function): f(x,y)=x^2+4xy+4y^2-2x+3y+6. actually, my problem is i dont know how to find the extrema of functions of this form f(x,y)=ax^2+bxy+cy^2+dx+ey+f.

Your help will be highly appreciated.

Thanks!